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State-resolved ultrafast charge and spin dynamics in [Co/Pd] multilayers

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arxiv 2110.15615 v1 pith:P7DC5YCM submitted 2021-10-29 cond-mat.mtrl-sci

Loïc Le Guyader , Daniel J. Higley , Matteo Pancaldi , Tianmin Liu , Zhao Chen , Tyler Chase , Patrick W. Granitzka , Giacomo Coslovich
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Alberto A. Lutman Georgi L. Dakovski William F. Schlotter Padraic Shafer Elke Arenholz Olav Hellwig Mark L.M. Lalieu Bert Koopmans Alexander H. Reid Stefano Bonetti Joachim Stöhr Hermann A. Dürr
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classification cond-mat.mtrl-sci
keywords fermileveldemagnetizationabovebelowdynamicslaser-excitedmultilayers
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We use transient absorption spectroscopy with circularly polarized x-rays to detect laser-excited hole states below the Fermi level and compare their dynamics with that of unoccupied states above the Fermi level in ferromagnetic [Co/Pd] multilayers. While below the Fermi level an instantaneous and significantly stronger demagnetization is observed, above the Fermi level the demagnetization is delayed by 35+/-10 fs. This provides a direct visualization of how ultrafast demagnetization proceeds via initial spin-flip scattering of laser-excited holes to the subsequent formation of spin waves.

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